7.3 Studder Problem
I bought a 7.3 Powerstroke and it studders while at 0-15% idle. Once boost reaches 5psi, the engine smooths out and runs strong to redline.
I have replaced:
crank position sensor
IPC - high pressure oil
IDM - new reman
new UVCH - both banks
new fuel filter and cap
It still studders at low rpm and chugs bad at 1500rpm - 2000rpm
It also idles rough.
I've brought the truck to two different powerstroke shops and neither shop has found the issue. The only good they have done is test the fuel pump and said that it still runs strong.
Any help would be very much appreciated.